Page authority in search engine optimization is the value a search engine assigns a web pages. The higher the value the more likely the search engine will return a new web pages in organic search outcomes.
Fixing some of the common SEO technical issues improves your website performance like website speed, proper redirects, content optimization, good indexing and crawling stats.
Domain Authority is used for anticipation of Page Rank. For SEO a Domain Authority metric helps to analyze the Domain Strength for its ranking abilities.
Website designing is also an important factor for being SEO friendly to get low bound rate, quality traffic, user interaction, leads and sales engagement through potential customers.